fbdev: matrox: use modern module_init()

This is one of the last drivers with a global init_module() function
instead of the modern module_init() annotation. Convert it over.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20210514213316.635070-1-arnd@kernel.org

drivers/video/fbdev/matrox/matroxfb_base.c

@@ -2486,8 +2486,6 @@ static int __init matroxfb_init(void)
 	return err;
 }
 
-module_init(matroxfb_init);
-
 #else
 
 /* *************************** init module code **************************** */
@@ -2572,7 +2570,7 @@ module_param_named(cmode, default_cmode, int, 0);
 MODULE_PARM_DESC(cmode, "Specify the video depth that should be used (8bit default)");
 #endif
 
-int __init init_module(void){
+static int __init matroxfb_init(void){
 
 	DBG(__func__)
 
@@ -2603,6 +2601,7 @@ int __init init_module(void){
 }
 #endif	/* MODULE */
 
+module_init(matroxfb_init);
 module_exit(matrox_done);
 EXPORT_SYMBOL(matroxfb_register_driver);
 EXPORT_SYMBOL(matroxfb_unregister_driver);